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Sentence Correction: Sentence vs. Clause vs. Fragment

Royal inscriptions in which the Assyrian king boasts of felling the mighty cedars of Lebanon and floating them downstream on the river Euphrates to build a temple clearly demonstrates the religious character of imperialist expansion in the ancient Near East and thus is highly valued as a source for the comparative study of religion.

Incorrect.

This answer choice is grammatically incorrect. The singular verbs demonstrates and is do not agree with the plural subject Royal inscriptions.

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Well done!

This answer choice corrects the Subject Verb Agreement mistakes in the original sentence by changing the singular verbs demonstrates and is to the plural verbs demonstrate and are.

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Incorrect.

Although this answer choice corrects one of the Subject Verb Agreement mistakes in the original sentence by changing the singular verb demonstrates to the plural verb demonstrate, it introduces a parallelism mistake by removing the second (parallel) verb is.

What helps us identify this parallelism mistake is the following Stop Sign:

A and/or/but B

In the original sentence A is the verb demonstrates and B is the verb is: both are the same part of speech, and are logically parallel. In the corrected sentence, removing is after the connector and (thus) violates the parallelism and is grammatically incorrect.

In addition, without the verb is, the sentence becomes a fragment. What precedes and thus is a clause, and what follows and thus should also contain a clause, which means that it should contain a conjugated verb too.

Incorrect.

While this answer choice corrects the Subject Verb Agreement mistakes in the original sentence by changing the singular verbs demonstrates and is to the plural verbs are (shown to demonstrate) and are, it introduces a stylistic flaw.

The phrase shown to demonstrate is redundant, since to show and to demonstrate mean the same thing.

Incorrect.

While this answer choice corrects the Subject Verb Agreement mistakes in the original sentence by changing the singular verbs demonstrates and is to the plural verbs are (a...demonstration) and are (highly valued), the first change creates a new grammatical mistake by mismatching parts of speech. The adverb clearly cannot be used to describe the noun demonstration. Only adjectives can describe nouns.

clearly demonstrates the religious character of imperialist expansion in the ancient Near East and thus is
clearly demonstrate the religious character of imperialist expansion in the ancient Near East and thus
clearly demonstrate the religious character of imperialist expansion in the ancient Near East and thus are
are shown to clearly demonstrate the religious character of imperialist expansion in the ancient Near East and thus are
are a clearly demonstration of the religious character of imperialist expansion in the ancient Near East and thus are